xls
What is a .xls file?
application/vnd.ms-excel
XLS is the legacy Microsoft Excel format using the binary BIFF structure inside an OLE2 compound file, superseded by XLSX in 2007. It stores worksheets, formulas, and formatting in a binary layout rather than XML. It remains common in older systems and exports.
How to use a .xls file
Use an example XLS to test legacy binary spreadsheet parsing, OLE2 compound-file handling, and converters that upgrade older workbooks to XLSX or CSV.